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Continuous calibration of Rogowski coil current transducer

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Abstract

Rogowski coils (RC) intended for high-accuracy contactless current measurement ask for precise sensor geometry and specific conditions, such as a centered primary conductor. To release these constraints, we propose in this paper a recently patented continuous calibration system which features a reference conductor added coaxially to the primary conductor and a proportional-integral controller integrated in CMOS technology. The chip is mounted on a board with a precise shunt and a AC reference signal generator. The magnitude of this reference signal may exhibit slow variations, only its frequency needs to be accurate, which is a great advantage. The architecture of the chip is described as well as the experimental setup. Experimental results obtained with commercial flexible RC show that the sensor immunity to the conductor position, as well as the dispersion between several RC, is reduced to ±0.1 %, i.e. a 0.1 class measurement. In addition, the system may ensure an absolute calibration of the RC current transducer, avoiding any costly calibration procedure at the end of the sensor manufacturing.

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Acknowledgments

The authors would like to acknowledge ABB Switzerland Ltd. Corporate research, for its financial support under contract ABB-InESS 063108.

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Authors and Affiliations

  1. ICube Laboratory, Université de Strasbourg, CNRS, 23 rue du Loess, BP 20, 67037, Strasbourg, France

    Simon Paulus, Jean-Baptiste Kammerer & Luc Hebrard

  2. University of Applied Sciences and Arts Northwestern Switzerland FHNW, Muttenz, Switzerland

    Joris Pascal

  3. ABB Switzerland Ltd. Corporate Research, Segelhofstr. 1K, 5405, Baden 5-Daettwil, Switzerland

    Calogero Bona

Authors
  1. Simon Paulus
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  2. Jean-Baptiste Kammerer
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  3. Joris Pascal
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  4. Calogero Bona
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  5. Luc Hebrard
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Correspondence to Luc Hebrard.

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Paulus, S., Kammerer, JB., Pascal, J. et al. Continuous calibration of Rogowski coil current transducer. Analog Integr Circ Sig Process 89, 77–88 (2016). https://doi.org/10.1007/s10470-016-0764-7

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  • DOI: https://doi.org/10.1007/s10470-016-0764-7

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